Patents by Inventor Makoto Morijiri

Makoto Morijiri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7605006
    Abstract: In forming a narrow pattern, it is difficult to form a lift-off resist pattern with an overhang shape. Accordingly, it results in a phenomenon in which the angle at the end of the GMR layer is reduced to 45° or less. It is necessary to provide a lift-off resist pattern that forms the end of the GMR film to be at an angle of as abrupt as 45° or more and ensures lift-off.
    Type: Grant
    Filed: January 11, 2006
    Date of Patent: October 20, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Makoto Morijiri, Haruko Tanaka, Junichi Tanabe
  • Patent number: 7576952
    Abstract: In one embodiment, a thin-film magnetic head with a write head has a lower core member made of a soft magnetic film, a planar upper core member made of a soft magnetic film, and a coil conductor positioned between the lower and upper core members. The rear end is equipped with a magnetic body, which at least magnetically joins the lower and upper core members. A magnetic pole piece is in contact with the lower core member and positioned toward an air bearing surface, which faces a recording medium. A first nonmagnetic film is provided between a pedestal magnetic pole piece and upper core member. The write head is structured so that the first nonmagnetic film constitutes a write gap. A second nonmagnetic film is provided above or below the first nonmagnetic film. The edge of the second nonmagnetic film is retracted from the air bearing surface. The upper core member's flare point is positioned toward the air bearing surface rather than the edge of the second nonmagnetic film.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: August 18, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Yoji Maruyama, Tadayuki Iwakura, Makoto Morijiri, Shigekazu Ohtomo, Ichiro Ohdake
  • Publication number: 20090073608
    Abstract: Embodiments of the present invention provide a perpendicular magnetic recording head suitable for high density recording that suppresses erasure after recording by reducing the remanent magnetization Mr of the main magnetic pole and thereby decreasing the squareness S. Accordingly to one embodiment, a main magnetic pole piece of a perpendicular magnetic recording head includes a FeCo ferromagnetic layer, into which a NiFe soft magnetic layer is inserted. Inserting the NiFe soft magnetic layer in a position in the FeCo ferromagnetic layer 1 to 7 mm away from a nonmagnetic layer allows a remanent magnetization Mr to be decreased without changing the number of layers of the nonmagnetic layer or a film thickness of the FeCo ferromagnetic layer. This helps suppress erasure after recording.
    Type: Application
    Filed: August 22, 2008
    Publication date: March 19, 2009
    Inventors: Norihiro Ookawa, Atsushi Kato, Makoto Morijiri, Tomohiro Okada, Wataru Kimura
  • Patent number: 7460335
    Abstract: A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.
    Type: Grant
    Filed: May 1, 2006
    Date of Patent: December 2, 2008
    Assignee: Hitachi Global Technologies Japan, Ltd.
    Inventors: Yohji Maruyama, Tadayuki Iwakura, Takashi Kawabe, Makoto Morijiri, Hiroshi Fukui
  • Patent number: 7382576
    Abstract: Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in2 or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: June 3, 2008
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Tomohiro Okada, Tetsuya Okai, Shinobu Sasaki, Tadayuki Iwakura, Naoki Koyama, Takashi Kawabe, Harunobu Saito, Makoto Morijiri
  • Patent number: 7333301
    Abstract: A thin-film magnetic head having little temperature rise in the element, good heat dissipation and a short magnetic path length (narrow coil pitch) and manufacturing method for same is provided. To form the coil of the thin-film magnetic head, a lower coil is first formed and after forming alumina and an inorganic compound containing alumina, a trench is formed for the upper coil by reactive ion etching. The lower coil allows uniform etching at this time and functions as a film to prevent loading effects occurring during reactive ion etching. This trench is then plated in copper and chemical mechanical planarization performed to form the upper layer coil as the dual-layer coil of the present invention. Heat from the coil is efficiently radiated towards the substrate by alumina and an inorganic compound containing alumina with good heat propagation.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: February 19, 2008
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Kimitoshi Etoh, Nobuo Yoshida, Moriaki Fuyama, Makoto Morijiri, Kenichi Meguro, Ichiro Oodake, Kazue Kudo, Yohji Maruyama, Katsuro Watanabe
  • Publication number: 20070079498
    Abstract: Multiple thin films of spin-valve GMR sensor are formed in a trapezoidal cross-sectional shape by laminating an antiferromagnetic layer, a pinned magnetic layer, a nonmagnetic conductive layer, a free magnetic layer and a nonmagnetic protective layer on a lower insulated gap layer. The amount of etching of the lower insulated gap layer produced in the process of patterning the spin-valve giant magnetoresistive layers into the multiple thin films of spin-valve GMR sensor is 10 nm or less. Further, the angle ? which the tangent line of each side face of the multiple thin films to the middle line of the free magnetic layer in its thickness direction forms with respect to the middle line of the free magnetic layer becomes 45 degrees or more. This structure makes it possible to provide such a spin-valve giant magnetoresistive head that it meets the requirements for securing constant breakdown voltage and preventing instability of MR output voltage waveform.
    Type: Application
    Filed: December 11, 2006
    Publication date: April 12, 2007
    Inventors: Masatoshi Arasawa, Haruko Tanaka, Makoto Morijiri, Koichi Nishioka, Shuichi Kojima, Masayasu Kagawa
  • Patent number: 7159304
    Abstract: Multiple thin films of spin-valve GMR sensor are formed in a trapezoidal cross-sectional shape by laminating an antiferromagnetic layer, a pinned magnetic layer, a nonmagnetic conductive layer, a free magnetic layer and a nonmagnetic protective layer on a lower insulated gap layer. The amount of etching of the lower insulated gap layer produced in the process of patterning the spin-valve giant magnetoresistive layers into the multiple thin films of spin-valve GMR sensor is 10 nm or less. Further, the angle ? which the tangent line of each side face of the multiple thin films to the middle line of the free magnetic layer in its thickness direction forms with respect to the middle line of the free magnetic layer becomes 45 degrees or more. This structure makes it possible to provide such a spin-valve giant magnetoresistive head that it meets the requirements for securing constant breakdown voltage and preventing instability of MR output voltage waveform.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: January 9, 2007
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Masatoshi Arasawa, Haruko Tanaka, Makoto Morijiri, Koichi Nishioka, Shuichi Kojima, Masayasu Kagawa
  • Patent number: 7150819
    Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %?Co?70 wt %, 10 wt %?Ni?25 wt % and 10 wt %?Fe?30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)?0.5 and I(110)/I(111)?1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: December 19, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Kazue Kudo, Yasuyuki Okada, Nobuo Yoshida, Moriaki Fuyama, Noriyuki Saiki, Gen Oikawa, Takashi Kawabe, Makoto Morijiri
  • Publication number: 20060198056
    Abstract: A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.
    Type: Application
    Filed: May 1, 2006
    Publication date: September 7, 2006
    Applicant: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Yohji Maruyama, Tadayuki Iwakura, Takashi Kawabe, Makoto Morijiri, Hiroshi Fukui
  • Publication number: 20060198051
    Abstract: Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in2 or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.
    Type: Application
    Filed: May 4, 2006
    Publication date: September 7, 2006
    Inventors: Tomohiro Okada, Tetsuya Okai, Shinobu Sasaki, Tadayuki Iwakura, Naoki Koyama, Harunobu Saito, Makoto Morijiri
  • Publication number: 20060172532
    Abstract: In forming a narrow pattern, it is difficult to form a lift-off resist pattern with an overhang shape. Accordingly, it results in a phenomenon in which the angle at the end of the GMR layer is reduced to 45° or less. It is necessary to provide a lift-off resist pattern that forms the end of the GMR film to be at an angle of as abrupt as 45° or more and ensures lift-off.
    Type: Application
    Filed: January 11, 2006
    Publication date: August 3, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Makoto Morijiri, Haruko Tanaka, Junichi Tanabe
  • Patent number: 7068467
    Abstract: Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in2 or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: June 27, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Tomohiro Okada, Tetsuya Okai, Shinobu Sasaki, Tadayuki Iwakura, Naoki Koyama, Harunobu Saito, Makoto Morijiri
  • Patent number: 7064925
    Abstract: A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: June 20, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Yohji Maruyama, Tadayuki Iwakura, Takashi Kawabe, Makoto Morijiri, Hiroshi Fukui
  • Publication number: 20050122622
    Abstract: In one embodiment, a thin-film magnetic head with a write head has a lower core member made of a soft magnetic film, a planar upper core member made of a soft magnetic film, and a coil conductor positioned between the lower and upper core members. The rear end is equipped with a magnetic body, which at least magnetically joins the lower and upper core members. A magnetic pole piece is in contact with the lower core member and positioned toward an air bearing surface, which faces a recording medium. A first nonmagnetic film is provided between a pedestal magnetic pole piece and upper core member. The write head is structured so that the first nonmagnetic film constitutes a write gap. A second nonmagnetic film is provided above or below the first nonmagnetic film. The edge of the second nonmagnetic film is retracted from the air bearing surface. The upper core member's flare point is positioned toward the air bearing surface rather than the edge of the second nonmagnetic film.
    Type: Application
    Filed: September 30, 2004
    Publication date: June 9, 2005
    Applicant: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Yoji Maruyama, Tadayuki Iwakura, Makoto Morijiri, Shigekazu Ohtomo, Ichiro Ohdake
  • Patent number: 6898057
    Abstract: The present invention is to provide a thin film magnetic head intended to increase precision of and to narrow a width which determines a track width of a write thin film magnetic head and to supply a stably high output substantially free from write blurring on a disk, and a method for manufacturing the same. The thin film magnetic head consisting of a magnetic circuit comprising a read head to read information, a lower magnetic film, a magnetic gap and an upper magnetic film formed with a magnetic gap between it and the lower magnetic film; and of a write head comprising a coil positioned between the upper magnetic film and the lower magnetic film and an insulating film for insulting the coil and the upper magnetic film from each other, wherein the upper magnetic film is configured of an upper first magnetic film, an upper second magnetic film and an upper third magnetic film, and the upper first magnetic film is connected to the upper third magnetic film via the upper second magnetic film.
    Type: Grant
    Filed: February 26, 2003
    Date of Patent: May 24, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuya Okai, Makoto Morijiri, Yoji Maruyama, Kimitoshi Etoh
  • Patent number: 6877212
    Abstract: A magnetic disk apparatus includes a magnetic reproducing head portion, and a magnetic recording head including a lower magnetic core and an upper magnetic core having a end portion and a rear portion. The rear portion is formed using a negative resist or an electron beam resist to form a frame for plating above the end portion of the upper magnetic core head.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: April 12, 2005
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Tomohiro Okada, Tetsuya Okai, Shinobu Sasaki, Tadayuki Iwakura, Naoki Koyama, Harunobu Saito, Makoto Morijiri
  • Publication number: 20050024767
    Abstract: Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a en d portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in2 or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.
    Type: Application
    Filed: September 3, 2004
    Publication date: February 3, 2005
    Inventors: Tomohiro Okada, Tetsuya Okai, Shinobu Sasaki, Tadayuki Iwakura, Naoki Koyama, Harunobu Saito, Makoto Morijiri
  • Publication number: 20040246621
    Abstract: A magnetic head capable of preventing magnetic flux leakage at a write head of the magnetic head and suitably used for achieving high recording density. The write head is characterized in that a lower core had a flare on a side of an air bearing surface and a facet of the lower core is recessed at least from the air bearing surface.
    Type: Application
    Filed: March 23, 2004
    Publication date: December 9, 2004
    Applicant: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Youji Maruyama, Tadayuki Iwakura, Makoto Morijiri
  • Publication number: 20040240121
    Abstract: A thin-film magnetic head having little temperature rise in the element, good heat dissipation and a short magnetic path length (narrow coil pitch) and manufacturing method for same is provided. To form the coil of the thin-film magnetic head, a lower coil is first formed and after forming alumina and an inorganic compound containing alumina, a trench is formed for the upper coil by reactive ion etching. The lower coil allows uniform etching at this time and functions as a film to prevent loading effects occurring during reactive ion etching. This trench is then plated in copper and chemical mechanical planarization performed to form the upper layer coil as the dual-layer coil of the present invention. Heat from the coil is efficiently radiated towards the substrate by alumina and an inorganic compound containing alumina with good heat propagation.
    Type: Application
    Filed: August 29, 2003
    Publication date: December 2, 2004
    Inventors: Kimitoshi Etoh, Nobuo Yoshida, Moriaki Fuyama, Makoto Morijiri, Kenichi Meguro, Ichiro Oodake, Kazue Kudo, Yohji Maruyama, Katsuro Watanabe